﻿using System;
using System.IO;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using WPFMediaKit.DirectShow.Controls;

namespace WPF_WPFMediaKit
{
    /// <summary>
    /// CameraWindow.xaml 的交互逻辑
    /// </summary>
    public partial class CameraWindow : Window
    {
        private int cameraIndex = 0;  //记录当前选择的摄像头的索引值
        private string imgTempPath = "";

        /// <summary>
        /// 测试用
        /// </summary>
        public CameraWindow()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            if (MultimediaUtil.VideoInputNames.Length > 0)
            {
                cameraIndex = 0;
                vce.VideoCaptureSource = MultimediaUtil.VideoInputNames[cameraIndex];

                if (MultimediaUtil.VideoInputNames.Length > 1)
                {
                    btnExChange.Visibility = Visibility.Visible;
                }
                else
                {
                    btnExChange.Visibility = Visibility.Hidden;
                }
            }
            else
            {
                MessageBox.Show("当前设备没有安装任何可用摄像头");
                this.Close();
            }
        }

        private void btnCapture_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                RenderTargetBitmap bmp = new RenderTargetBitmap((int)vce.ActualWidth, (int)vce.ActualHeight, 96, 96, PixelFormats.Default);

                vce.Measure(vce.RenderSize);
                vce.Arrange(new Rect(vce.RenderSize));
                bmp.Render(vce);
                BitmapEncoder encoder = new JpegBitmapEncoder();
                encoder.Frames.Add(BitmapFrame.Create(bmp));

                //创建图片存储路径，每个工程一个文件夹
                string directory = AppDomain.CurrentDomain.BaseDirectory + "Images" ;
                if (!Directory.Exists(directory))
                {
                    Directory.CreateDirectory(directory);
                }

                //可能会多次拍摄，在图片后加上时间戳
                string imgName = "img" + DateTime.Now.ToString("yyyyMMddHHmmssffff");
                imgTempPath = AppDomain.CurrentDomain.BaseDirectory + "Images\\" + imgName + ".bmp";
                FileStream fstream = new FileStream(imgTempPath, FileMode.Create);
                encoder.Save(fstream);
                fstream.Close();
                vce.Pause();
                btnConfirm.Visibility = Visibility.Visible;
                btnReStart.Visibility = Visibility.Visible;
            }
            catch (Exception ex)
            {
                if (vce.ActualWidth == 0 || vce.ActualHeight == 0)
                {
                    MessageBox.Show("请勿重复按钮");
                    return;
                }
                else
                {
                    MessageBox.Show(ex.Message);
                    return;
                }
            }
        }

        private void btnReStart_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                vce.Play();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

        }

        private void btnExChange_Click(object sender, RoutedEventArgs e)
        {
            if (MultimediaUtil.VideoInputNames.Length > 1)
            {
                if (vce.VideoCaptureSource == MultimediaUtil.VideoInputNames[0])
                {
                    vce.VideoCaptureSource = MultimediaUtil.VideoInputNames[1];
                }
                else
                {
                    vce.VideoCaptureSource = MultimediaUtil.VideoInputNames[0];
                }
            }
            else
            {
                MessageBox.Show("当前设备没有可切换的摄像头!");
            }
        }

        private void btnConfirm_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                if (imgTempPath != "" && File.Exists(imgTempPath))
                {
                    this.Close();
                }
                else
                {
                    MessageBox.Show("图片丢失，请重新拍摄。");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

    }
}
